Telephone receiver



April 21, 1925. 1,534,910

R. C. BROWNE TELEPHONE RECE IVER Filed Sept. 9. 1922 3 Sheets-Sheet 1 (ZBrowney mgb AprilZl, 1925. 1,534,910

R. c. BROWNE TELEPHONE RECEIVER Filed Sept. 9. 1922 3 Sheets-Sheet 2 April 21, 1925. 1,534,910

R. C. BROWNE TELEPHONE RECEIVER Filed Sept. 9. 1922 3 Sheets-Sheet 5 Patented Apr. 21, 1925.

UNITED STATES RALPH C. BROWNE, 0F SALEM, MASSACHUSETTS.

TELEPHONE RECEIVER.

Application filed. September 9, 1922. Serial No. 587,124.

To all whom it may concern:

Be it known that I, RALPH C. BROWNE, citizen of the United States, residing at Salem, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Telephone Receivers, of which the following is a specification.

, This invention relates to telephone receivers and more particularly to what is known as loud speakers or amplifying receivers especially adapted for use with radio.

One of the objects of the present invention is to provide an instrument of the above character that will produce tones true in character and of great volume.

A further object is to provide an apparatus of the above character having relatively few parts which may be inexpensively manufactured and assembled.

A further object is to provide a light, compact and self-contained apparatus or device adapted to be used with commercial radio sets now on the market for amplifying and reproducing sounds in a clear and distinct manner. I I

A further object is to provide a device of the above character with adjustments whereby it may be tuned to respond to one particular frequency, thereby enabling the spark signals to be read through strong static.

, Other objects will be in part obvious and in part hereinafter pointed out.

The invention accordingly consists in the features of construction, combination and arrangement of parts, and in the unique relation of the members and of the relative proportioning and disposition thereof, all as more completely hereinafter outlined.

To enable others skilled in the art to fully understand and comprehend the underlying features of this inventon, and in order that they may embody the same by numerous modifications in structure and relation con templated by this invention, drawings depicting several desired forms have been annexed and made part of this disclosure and in such drawings like reference characters denote corresponding parts throughout all the views, in which Figure 1 is a semi-diagrammatic sectional plan view showing the essential circuits and arrangement of the component parts utilized in-the invention in its simplest form;

Figure 2 is a similar view showing a slight modification in the method of attaching the diaphragm to the vibrating member;

A Figure 3 is an elevational view taken substantially on the line 3-3 of Figure 1;

Figure tis a detail View illustrating the shape of the conducting and vibrating member attached to the diaphragm;

Figure 5 is a sectional perspective View of an ear receiver;

Figure 6 is a View similar to Figure 1 with a transformer attachment shown digram matically; and

Figure 7 is a view similar to Figure 1, showing the method of tuning the vibrating member.

In order that a clearer conception of the present invention may be had and the objects sought to be accomplished, it may be stated that instruments of this character heretofore have comprised a coil of wire adapted to receive a telephonic current, said coil being adapted to vary the magnetic pull on a diaphragm as in the ordinary receiver or be itself connected with a suitable diaphragm and thereby transmit to it vibrations brought about by reason of the reaction between currents'traversing it and an associated field of magnetic force. Either of the classes referred to have certain defects. In the first case, the diaphragm is at all times subjected to a magnetic pull and is thereby under tension which is objectionable, and in the second case, the coil and its necessary support add undesirable weightto the diaphragm. Other arrangements have been suggested based upon the polarized type of relay, but these arrangements have had an even more serious drawback in the introduction of pivoted levers and mechanism that tends to rattle and produce false tones.

All of the above defects are overcome in the present invention and results are attained in a class by themselves. Moreover,

if desired the present device may be mechanically tuned to respond to one particu lar frequency and thereby becomes particularly efiicient in recording spark signals in wireless telegraphy, thereby enabling the signals to be read under most adverse static conditions.

Referring now to the drawings in detail, and more particularly to Figure 1, 10 denotes a a e membe 91 any de ire yp "aluminum wire, although-I do not limit inyself'to thepartic ular shape or material. This conductor 12 is'attach'ed at one end to a -fiXedclamp 13 insulated from the rest of the mechanism by means of block 14:. The

opposite end is rigidly attached to a dia phra'gm 1'5 mounted in a' suitable support 16 secured, as by means of fastening devices 17; to the poles N and S. With this arrangement I find that a telephone current entering through loads 18 and 20 and allowed to traverse the conductor 12 will cause the same to be thrown into vibration in synchronism 1with the polarization or wave of the telephone current. The vibrations occurring in the conductors 12 have two components,-that is, transverse and longitudinal. The longitudinal vibrations are utilized in moving the diaphragm f15to.which it is attached. It will be'noted'that the movement'oi": the diaphragm and the movement of the vibration utilized in'th'e conductor 12 is in the same direction as the "flow of current through the conductor. This type of apparatus represents the simplest arrangement and it will be noted that the moving parts in addition to the diaphragm are extremely lightespecially when aluminum is used for the conductor.

In actual operation of the device, excellent results have been obtained by using the arrangement shown, in Figure 2. In this case instead of directly connecting the end of-the conductor 12. to the diaphragm 15 I preferto connect' one end of the conductor 12 to a lever 21 pivoted at 22, the opposite end'of which lever is connected to the center of the diaphragm as shown. This construction isfsiinilar' to that utilized in the manufacture of sound boxes or phonographs, as

is well known in the artpertaining' to such apparatus.

construction is to do away with any lateral One of the objections of this displacement of the conductor 12 being imparted to thediaphragm and also to control 'the amplitude ofmovement. The conductor l2, i as%shown in; Figure 4', is not in' practice stretched tightly between the clamp 13 and the "diaphragm .15, but preferably has a slight bend; as indicated and is without ten- 'sion. --This enables the conductor to vibrate unifprmly with the wave of the telephonic carr nmnd alsofrees the diaphragm from anyundesirable tension. 'In special cases where-1tis desiredto tune for one particular veniently attached.

to, but insulatedfrom the pole pieces N and S.

In order to obtain the highest efficiency,

an apparatussuch as illustrated in Figure 6 may be used. wherein there is indicatedjbe tween the leads 18 and20 atransformer 24:.

This is especially desirableif the telephonic current has a comparatively high: voltage and low amperage; arid it is desired ifto change its characteristics, thereby producing a current of comparatively high amperage and low voltage through the conductor 12. The member 16 is provided with a nipple '25 to which an amplifying horn maybe con- If desired the size of the component parts of the system 'he'rein illustrated and described may be reducedand readily installed in an ordinary watch case head receiyei as shown in Figure 5; In this case thereis em ployed a permanent magnet 26 havingpoles N and S and betweenthese poles there is placed the conduptor 12in contact'at one end with the diaphragm 15 and at the opposite end clamped by any suitable means to the back of the case-27 the other part of'the case 28 being screwed thereto inthe usual manner. The essential parts of the mechanism are substantially the same in construction and operation as abovedescribed. This, howeverppermits one to make the diaphragm '15 of very light'mica and likewise use a very light conductor 12 thereby giving a most sensitive arrangement well adapted for the uses for which head receivers ardcomnionly applicable.

It will thus be .seen that the presentinvention provides a simple andpractical receiver well adapted for use as an amplifier for radio systems and adapted to accomplish, among others, all of the objectsand advantages herein set forth.

Without further analysis the foregoing will so fully reveal the gist of this invention that others may readily adaptlitfor various applications without omitting certain features that from the standpoint of the prior art fairly constitute essential characteristics of the generic or specific aspects of .thisinvention and, therefore, such adaptations should and are intended. to..b'e comprehended within the .meaning and range 5 of equivalency of the following claims. I claim:

1. A telephone receiver. comprising pole pieces having a Inagnetiofieldtherehetween, a single conductor having semi-rigid than acteristics Within said field and a diaphragm, connected with said conductor, said parts being so relatedthat a telephonic current passing through said conductor will out the lines of force of the field thereby to set up a moving force in said conductor to vibrate said connected diaphragm.

2. A telephone receiver comprising pole pieces having a magnetic field therebetween, a semi-rigid conductor passing through said field, a diaphragm connected to said conductor, and means whereby a telephonic current passing through said conductor will cause said conductor to exert a moving force on said diaphragm to thereby vibrate the same, the vibrations of said diaphragm being synchronous with the operating current flowing through said conductor.

3. A telephone receiver comprising pole pieces having a magnetic field therebetween, and a conductor extending through said field, one end of said conductor being positively clamped, the opposite end of said conductor being mechanically connected to said diaphragm, whereby vibration of said conductor is transmitted to the diaphragm at one end thereof.

4. Atelephone receiver comprising a diaphragm, a bent conductor having one end connected to said diaphragm, pole pieces adapted to produce a magnetic field there between said conductor being positioned in said field, and a clamp for holding the opposite end of said conductor.

5. A telephone receiver comprising a diaphragm, a conductor attached to said diaphragm, a clamping member for said conductor, and a pole piece having magnetic field therebetween said conductor being positioned in said field, said magnetic field being so related to said conductor that a telephonic current passing through said conductor will act to alternately push and pull the diaphragm to thereby vibrate the same.

6. A telephone receiver comprising pole pieces having a magnetic field therebetween, a substantially rigid conductor within said field, one end of said conductor being fixed a diaphragm connected with the other end of said conductor whereby a telephonic current passing through said conductor will vibrate said diaphragm by vibrations set up in said conductor.

7 A telephone receiver comprising pole pieces having a magnetic field therebetween, a single conducting rod in said field, a diaphragm connected therewith, whereby as the telephonic current passes through said conducting rod and imparts a moving force thereto the diaphragm will be vibrated.

8. A telephone receiver comprising pole pieces having a magnetic field therebetween, a single conductor within said field, a diaphragm mechanically connected ith said conductor, whereby the diaphragm will vibrate as the current passes through said conductor, said conductor comprising a slightly curved rod securely held at one end and attached to the diapl'n'agm at its other i end.

9. A telephone receiver comprising pole pieces having a magnetic field therebetween, a single conductor within said field and a diaphragm mechanically connected with said conductor, whereby the diaphragm will vibrate as the current passes through said conductor, said conductor comprising a slightly curved semi-rigid wire securely held at one end and attached to the diaphragm at its other end, and means for varying the curvature of said wire.

10. A telephone receiver comprising a base, a permanent magnet associated with said base, a single conductor extending through the field of said magnet between its poles, and a diaphragm to which the other end of said armature is connected, whereby as a telephonic current passing through said conductor will cause said conductor to exert a moving force on said diaphragm, synchronous with the fluctuations of said telephonic current, said moving force being inherent to the electric current and to said conductor.

11. A telephone receiver comprising a base, a magnet mounted on said base, a conductor positioned transversely in the field of said magnet, a clamping member holding one end of said conductor, a diaphragm secured to the opposite end of said conductor, the magnetic field surrounding said conductor being so related thereto that a current passing through said conductor will result in the vibration thereof, said conductor when vibrated adapted to inherently impart a moving force to said diaphragm synchronous with the fluctuations of the current passing through said conductor.

12. A telephone receiver comprising a base, coils mounted on said base, magnetic core members of rectangular shape associated with said coils for creating a magnetic field, a conducting rod transversely disposed in said field, a clamping member -for one end of said wire, a diaphragm to which the other end of said conducting rod is connected, and means for regulating the tension on said conducting rod, said parts being so positioned that a current passing through said conductor will cause the same to vibrate and to inherently impart vibrations to the diaphragm positioned at one end thereof 13. A telephone receiver comprising pole pieces having a magnetic field therebetween, an aluminum wire mounted in said field, and a diaphragm connected to one end of said wire said aluminum wire adapted to inherentlyimpart-a moving force to said diawire, the other end oi said. Wine; being fined, phragln'when" atelephonic current is passed said -a1uminum-wire adapted: to inherently through said Wire. impart a moving force to said diaphragm 10 14:. A telephone receiver comprising pole when a telephonic current is passed through pieces having a magnetic field therebe'tween said; Wire.

an aluminum Wire mounted in said field, and In testimony whei eof I affixmy signature. a diaphragm connected to one end of said RALPHC. BBOVVNE. 

